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Halogen atom effect on photophysical and photodynamic characteristics of deriva...
Serra, A. C.; Pineiro, M.; Gonsalves, A. M. d'A. Rocha; Abrantes, M.; Laranjo, M.; Santos, A. C.; Botelho, M. F.Brominated and iodinated derivatives of 5,10,15,20-tetrakis(3-hydroxyphenyl)porphyrin were synthesised directly from the corresponding aldehydes. Photophysical and photochemical properties, singlet oxygen formation quantum yields, photobleaching and log P were measured. Cellular uptake measurements and cytotoxicity assays on WiDr and A375 tumour cell lines were performed. 5,10,15,20-Tetrakis(2-bromo-5-hydroxyph...
Analysis of a Non-Iterative Algorithm for the Amplitude and Phase Difference Es...
Janeiro, Fernando M.; Ramos, Pedro M.; Tlemçani, Mouhaydine; Serra, A. C.In this paper, a non-iterative algorithm for amplitude and phase difference estimation of two acquired sinewaves is presented and analyzed. The method is based on the least-squares fitting of ellipses where the common signal frequency is eliminated from the algorithm.
A view on the mechanism of metalloporphyrin degradation in hydrogen peroxide ep...
Serra, A. C.; Marçalo, E. C.; Rocha Gonsalves, A. M. d'A.The stability of biomimetic catalysts is an essential characteristic for them to be of some practical use. The study of the reaction of metalloporphyrin catalysts in hydrogen peroxide oxidations in the presence of benzoic acid allowed to understand whether an intramolecular or intermolecular mechanism is operative in catalyst degradation. Under certain reaction conditions, the presence of a radical inhibitor mi...
Low temperature matrix-isolation and solid state vibrational spectra of 5-chlor...
Bugalho, Susana C. S.; Serra, A. C.; Lapinski, Leszek; Cristiano, M. Lurdes S.; Fausto, RuiThe vibrational spectra of 5-chlorotetrazole (CN4HCl) isolated in an argon matrix (T=8.5 K) and in the solid state (at room temperature) were studied. The infrared spectrum of monomers of 5-chlorotetrazole isolated in an argon matrix agrees well with the spectrum predicted theoretically (DFT(B3LYP)/6-31G*) for the 2H-tautomer of the compound. The bands assigned to the 1H-tautomer appear in the experimental spec...
Low temperature matrix-isolation and solid state vibrational spectra of 5-chlor...
Bugalho, Susana C. S.; Serra, A. C.; Lapinski, L.; Cristiano, Maria Lurdes Santos; Fausto, R.The vibrational spectra of 5-chlorotetrazole (CN4HCl) isolated in an argon matrix (T ¼ 8.5 K) and in the solid state (at room temperature) were studied. The infrared spectrum of monomers of 5-chlorotetrazole isolated in an argon matrix agrees well with the spectrum predicted theoretically (DFT(B3LYP)/6-31G*) for the 2Htautomer of the compound. The bands assigned to the 1H-tautomer appear in the experimental spe...
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